A FILTER DEVICE

Abstract: This invention relates to a filter device for filtration of ventilation air in buildings and dust separation in industrial process air, comprising a filter frame and a filter module insertable in the frame. According to the invention the filter device is characterized in that the filter frame (1) is made of a biological fibre material and that the filter module (2) comprises a biological fibre material containing flax and/or cotton and/or wool, whereby the filter device is possible to destruct without any harmful influence on the environment.

Description: A FILTER DEVICE. 1 This invention relates to a filter device for filtration of ventilation air in buildings and dust separation in industrial process air, comprising a filter frame and a filter module insertable in the same. Known filter devices comprise a filter frame which is made of steel or aluminium and a filter module arranged in the same, which module is made of glass fibre fabric or a synthetical material. This type of filter device is not possible to recycle, and therefore, after an exchange of the filter device, having served its time, this one as a rule ends up on a refuse dump. This is, of course, not acceptable with the hard requirements on the environment which all activities nowadays are subjected to, and which mean that terms like circulation- thinking and recycling have become of current interest. Thus, manufacturers of filter devices should be subjected to requirements that the filter devices either should be able to be distracted without influence on the exterial environment or be recycled in a suitable way. This invention intends to remove the problem with known technique and to present a filter device which can be destructed in a suitable way within the scope of existing requirements on the environment. This destruction is made by burning up the filter device without influence on the exterial environment or by composting. The solution of the problem is a filter device of the kind mentioned by way of introduction which is characterized by the fact that the filter frame is made of a destructable, biological fibre material, and that the filter module comprises a biological filter material, comprising flax and/or cotton and/or wool and which can accordingly be destructed without any obvious influence on the environment. The invention shall be described more closely with reference to the accompanying drawings, in which Fig 1 shows a filter device according to invention, Fig 2 shows a filter frame according to invention, Fig 3, 4 shows a cross-section of two different embodiments of filter frames, and Fig 5 shows a side view of a filter pocket being an integral part of a filter module according to the invention. Referring to fig 1 is shown there a filter device according to the invention and comprising of a filter frame 1 and a filter module 2, which comprises four filter pockets 3-6. The filter frame 1 can have that design shown in fig 2. The frame is made of wood, wood fibres and/or wellboard material. Due to that fact the filter frame can be destructed by combustion with only a small influence on the environment, which is within acceptable limits. Alternatively, the filter frame can be destructed by composting. This embodiment of the filter frame is provided with three rods 7-9, the purpose of which is partly to give the frame strength, partly to fixate the filter pockets of the filter module. The rods are suitably made of the same material as the frame. Of course, the number of rods can vary depending upon the type and the size of the filter. As is apparent from fig 1 the filter module 2 according to this embodiment comprises four filter pockets 3-6, which are arranged beside each other. In this connection a front portion of one filter pocket is put together with a front portion of an adjacent filter pocket. Each filter pocket 3-6 comprises two side portions 10, 11, which are sewn together both at the top and at the bottom of the filter pocket. Due to that fact there are formed seams 12 which accordingly close up the pockets. The number of filter pockets can of course vary from one and upwards, and they are made of a filter cloth which is normally unrolled on a roll. The filter cloth is made of biological fibres and comprises flax and/or cotton and/or wool. Due to that fact a destruction of the filter module after use is made possible by combustion or by composting. In order to prevent the filter cloth to be sucked together during use so that the filter surface on the inside of the filter pockets can be utilized maximally, distance elements are arranged at different places inside of the filter pocket. As is apparent from fig 2 the frame 1 has a plurality of plugs 13, made of wood, the purpose of which is to keep the frame together in those cases when the frame is made in two parts. In figs 3 and 4 are shown vertical sections through two different embodiments of the frame itself, indications being also made how the filter cloth is fastened in the frame. As is apparent from fig 3 the frame 1 is divided into two frame halves 14, 15, the frame half 14 during the use of the frame comprising the inner half and the frame half 15 accordingly the outer one. The inner frame half 14 is provided with a sealing strip 16 for allowing a sealing application of the filter device in that channel where the air shall be purified. The outer half 15 of the frame is intended to be fastened together with the inner half 14 by means of wood plugs 13. The reason for making the frame in two halves is that the front portion of the filter module 2 shall be fastened between the frame halves 14, 15. For this reason the filter cloth of the filter module is provided with projections 17 which are intended to be applied and clamped between the frame halves 14, 15. In figs 3 and 4 also a rod 18 is indicated, around which the filter cloth in intended to be laid. The device according to fig 4 differs from that one according to fig 3 in that way that the filter module is still better fastened between the frame halves. The reason for that is that the projections 17 of the filter cloth between the frame halves at their very front portions are provided with a strip 19 which is intended to be applied in a corresponding groove 20, which is milled out in the frame. In fig 5 is shown a side view of a filter module. In this connection are shown the projections 17 for attachment between the frame halves 14, 15 of the frame. Furthermore is shown the strip 19 which is applied at the very front portions of the projections 17. With the numerals 21 are indicated the distance elements, which are arranged inside of the filter pocket of the filter module. An important advantage with the filter device according to the invention is that air particles in a room where the new filter device is used do not become electrically charged as the case should be if a conventional filter comprising a synthetical material should be used. Due to that fact the air environment becomes more lenient to those persons being in the room in question. The invention is of course not limited to the mentioned embodiments but can be modified within the scope of the following claims.

Claims: Claims 1. A filter device for filtration of ventilation air in buildings and dust separation in industrial process air, comprising a filter frame and a filter module insertable in the frame, characterized in that the filter frame (1) is made of a biological fibre material and that the filter module (2) comprises a biological fibre material containing flax and/or cotton and/or wool, whereby the filter device is possible to destruct without any harmful influence on the environment. 2. A filter device according to claim 1, characterized in that the filter module (2) at least comprises one filter pocket (3-6), the front portion of the filter pocket having projections (17) for fastening in the filter frame (1). 3. A filter device according to claim 2, characterized in that the filter frame (1) is divided into two frame halves (14, 15), which are intended to take up the projections (17) of the filter module (2) between themselves for clamping of these ones, and that the frame halves (14, 15) are intended to be fastened together by means of wood plugs (13). 4. A filter device according to claim 2 or 3, characterized in that the projections (17) surround the entire filter module independent upon the number of filter pockets in the same, whereby the projections (17) get a frame-like design on the filter module. 5. A filter device according to any one of the claims 2-4, characterized in that the projections (17) are provided with a strip (19) at their very front portions, which strip is intended to be applied in a corresponding groove (20) of the filter frame (1). 6. A filter device according to any one of the claims 2-5, characterized in that distance elements (21) are arranged inside of the filter pockets (3-6) in order to prevent that these ones are sucked together during use. 7. A filter device according to any one of the preceding claims, character¬ ize d in that the frame is made of wood and/or wood fibres and/or wellboard material.

Inventors: BRUSELL TOMMY, RETZELL ARNE, BRUSELL, TOMMY, RETZELL, ARNE
Applicants: BRUSELL TOMMY, INTERCATOR AB, RETZELL ARNE, BRUSELL, TOMMY, RETZELL, ARNE
Application year: 1994
Main classification: B01D39
IPC codes: B01D39, B01D46, F24F3, F24F7